where is jimmy hoffa. so many questions. but last, one answer. >> today, i'm very proud of myself. >> reporter: yet, donald trump has finally revealed the secrets to his hair. >> i have people that actually have been studying it. and they cannot believe what they're finding. >> reporter: it's been the suggest of years of comedic speculation. >> donald trump often appears on fox, which is ironic. because a fox often appears on donald trump's head. >> reporter: but now, you might say, trump has let his hair down in an interview with "rolling stone," telling the magazine, okay. what i do is wash it with head & shoulders. i don't dry it, though. i let it dry by itself. it takes about an hour. i then comb my hair, he says. yes, i do use a comb. a comb? no way. but it's not really a combover, he claims. it's sort of a little bit forward and back. yes, it is all his hair, as he just showed ryan seacrest. >> it is my hair. you see? >> reporter: but how does it work? we went to hair stylist, edward jacoby. when you look at donald tru